A263029 Numbers n such that A002322(n) + 1 is not a prime, where A002322 is Carmichael lambda.

25, 32, 50, 55, 75, 81, 96, 100, 110, 115, 119, 121, 128, 150, 153, 160, 162, 165, 176, 187, 200, 203, 209, 215, 220, 221, 224, 230, 235, 238, 242, 245, 253, 256, 261, 275, 287, 288, 289, 295, 297, 299, 300, 306, 319, 323, 324, 330, 335, 343, 345, 355

Offset

1,1

Comments

Complement of A263028.

Links

Antti Karttunen, Table of n, a(n) for n = 1..25794

Mathematica

Select[Range[1, 400], ! PrimeQ[CarmichaelLambda[#] + 1] &]

Prog

(Magma) [n: n in [2..400] | not IsPrime(CarmichaelLambda(n)+1)];
(PARI) for(n=1, 1e3, if(isprime((1 + lcm(znstar(n)[2]))) == 0, print1(n", "))) \\ Altug Alkan, Oct 12 2015

Crossrefs

Cf. A002322, A263027, A263028.

Positions of zeros in A296077.

Cf. also A039689.

Sequence in context: A172007 A107258 A258876 * A225418 A035140 A050694

Adjacent sequences: A263026 A263027 A263028 * A263030 A263031 A263032

Keyword

nonn,easy

Author

Vincenzo Librandi, Oct 12 2015

Status

approved